A loudspeaker line detection device
By designing a loudspeaker line detection device, employing a dual-bridge common-pole circuit and a composite filter network, the problems of time-consuming and service interruptions associated with traditional detection methods were solved, enabling fast and accurate line fault detection in ship broadcasting systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINESE PEOPLES LIBERATION ARMY UNIT 91197
- Filing Date
- 2025-04-21
- Publication Date
- 2026-06-12
AI Technical Summary
Troubleshooting traditional shipboard broadcasting systems relies on segmented power outage detection and point-by-point multimeter measurements. This process is time-consuming and can cause broadcast service interruptions. Furthermore, the equivalent resistance measurement results of parallel branches interfere with the actual impedance state.
Design a loudspeaker circuit testing device that employs a dual-bridge common-pole circuit for the detection and indication units. Utilize rectifier diodes and filter capacitors to form a composite filter network, combined with a current-limiting resistor, to achieve nonlinear detection, breaking the dependence on equivalent impedance and enabling real-time online detection while the broadcast system is in continuous operation.
It enables accurate identification of speaker line type and faults without interrupting broadcast services, effectively suppresses power grid interference, and improves the accuracy of fault diagnosis and the real-time performance of detection.
Smart Images
Figure CN224356269U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of communication testing equipment technology, and specifically relates to a speaker circuit testing device. Background Technology
[0002] As a crucial infrastructure for shipboard safety communication, the shipboard public address system serves the dual functions of daily broadcasting and emergency command. Currently, mainstream shipboard public address systems primarily employ a dual-mode architecture for music broadcasting and command broadcasting. Music broadcasting is driven by the power amplifier via console software, while command broadcasting relies on real-time voice transmission from a handheld terminal. Both broadcasting modes utilize a three-wire power amplifier output port for signal distribution. Port 1 is the common port, port 2 is dedicated to music broadcasting input, and port 3 handles command broadcasting input. A switching circuit is used to drive the speakers for different broadcasting modes.
[0003] In practical engineering applications, ship cabin structures exhibit significant complexity: the internal bulkheads are interwoven, and the functional compartments are arranged in a honeycomb pattern, necessitating a multi-level series-parallel topology for the speaker wiring system. Specifically, the main line from the amplifier output to the area junction boxes is connected in series, with each junction box extending in parallel, and each individual junction box forming a secondary parallel network with its corresponding speaker group. While this multi-layered nested cable architecture meets the requirements for full-ship sound field coverage, it presents serious challenges for fault diagnosis.
[0004] Traditional troubleshooting primarily relies on sectional power-off testing and point-by-point multimeter measurements. However, this approach reveals several drawbacks in the actual working environment of ships: First, power-off testing requires disconnecting circuits step-by-step, which is not only time-consuming but also disrupts broadcast services. Second, when using a standard multimeter, the equivalent resistance of parallel branches interferes with the measurement results, especially in multi-stage parallel structures, where the measured values cannot accurately reflect the true impedance state of a specific node. Utility Model Content
[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the reliance on segmented power outage detection and point-by-point measurement with multimeters for troubleshooting traditional ship broadcasting systems. This not only consumes time but also causes broadcasting service interruptions. The invention provides a speaker line testing device to solve the problems existing in the prior art.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] A loudspeaker circuit testing device includes a testing unit comprising a dual-bridge common-pole circuit and an indicator unit connected to the output of the testing unit. The input of the testing unit is connected to the power amplifier output of the loudspeaker under test.
[0008] Further improvements to this technical solution include: the detection unit is configured with a first detection interface, a second detection interface, and a third detection interface; the dual-bridge common-pole circuit includes rectifier diodes D1, D2, D3, D4, D5, D6, D7, and D8.
[0009] The positive terminals of rectifier diodes D1, D2, D3, and D4 are all connected to the first detection interface of the detection unit; the negative terminals of rectifier diodes D1 and D5 are connected to the first terminal of the indicator unit; the positive terminals of rectifier diodes D5 and D6 are connected to the second detection interface of the detection unit; the positive terminals of rectifier diodes D6 and D2 are connected to the second terminal of the indicator unit; the negative terminals of rectifier diodes D3 and D7 are connected to the third terminal of the indicator unit; the positive terminals of rectifier diodes D7 and D8 are connected to the third detection interface of the detection unit; and the positive terminals of rectifier diodes D8 and D4 are connected to the fourth terminal of the indicator unit.
[0010] A further improvement to this technical solution is that the detection unit also includes a capacitor C1. The first end of the capacitor C1 is connected to the positive terminal of the rectifier diode D5 and the negative terminal of the rectifier diode D6, and the second end of the capacitor C1 is connected to the second detection interface of the detection unit.
[0011] A further improvement to this technical solution is that the detection unit also includes a capacitor C2. The first end of the capacitor C2 is connected to the positive terminal of the rectifier diode D7 and the negative terminal of the rectifier diode D8, and the second end of the capacitor C2 is connected to the third detection interface of the detection unit.
[0012] Further improvements to this technical solution include that the indicator unit includes indicator LED1 and indicator LED2;
[0013] The first terminal of indicator LED1 is connected to the negative terminals of rectifier diodes D1 and D5, and the second terminal of indicator LED1 is connected to the positive terminals of rectifier diodes D6 and D2.
[0014] The first terminal of indicator LED2 is connected to the negative terminals of rectifier diodes D3 and D7, and the second terminal of indicator LED2 is connected to the positive terminals of rectifier diodes D8 and D4.
[0015] A further improvement to this technical solution is that the indicator unit also includes a resistor R1, the first end of which is connected to the first end of the indicator LED1, and the second end of which is connected to the negative terminals of the rectifier diodes D1 and D5.
[0016] A further improvement to this technical solution is that the indicator unit also includes a resistor R2. The first end of the resistor R2 is connected to the first end of the indicator LED2, and the second end of the resistor R2 is connected to the negative terminals of the rectifier diodes D3 and D7.
[0017] Further improvements to this technical solution include a housing, inside which is a circuit board for mounting the detection unit and the indicator unit.
[0018] A further improvement to this technical solution is that the housing is provided with mounting holes corresponding to indicator lights LED1 and LED2.
[0019] Further improvements to this technical solution include the addition of probes connected to each detection interface.
[0020] The beneficial effects of this utility model are as follows: Based on the nonlinear detection characteristics of the dual-bridge common-pole circuit, this utility model breaks through the dependence of traditional measuring equipment on equivalent impedance. During detection, the speaker circuit type is determined by the on / off status of LED1 and LED2 in the indicator unit, which is simple and clear. In addition, the filter capacitors C1 and C2 configured in the detection unit form a composite filter network with the rectifier diode, which effectively suppresses voltage fluctuation interference in the ship's power grid. Combined with the protection circuit composed of current-limiting resistors R1 and R2, the device can achieve real-time online detection while the broadcast system is in continuous operation, avoiding communication interruption caused by traditional power failure detection.
[0021] Furthermore, the design principle of this utility model is reliable, the structure is simple, and it has a very wide range of application prospects.
[0022] It is evident that this utility model has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description
[0023] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is the circuit diagram of the device. Detailed Implementation
[0025] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
[0027] like Figure 1 As shown, this utility model provides a speaker circuit testing device, including a testing unit containing a dual-bridge common-pole circuit and an indicator unit connected to the output terminal of the testing unit. The input terminal of the testing unit is connected to the power amplifier output terminal of the speaker to be tested.
[0028] Specifically, the detection unit is equipped with a first detection interface, a second detection interface, and a third detection interface; the dual-bridge common-polarity circuit includes rectifier diodes D1, D2, D3, D4, D5, D6, D7, and D8; the positive terminals of rectifier diodes D1, D2, D3, and D4 are all connected to the first detection interface of the detection unit; the negative terminals of rectifier diodes D1 and D5 are all connected to the first detection interface of the detection unit. The positive terminals of rectifier diodes D5 and D6 are connected to the first terminal of the indicator unit, respectively. The positive terminals of rectifier diodes D6 and D2 are connected to the second terminal of the indicator unit. The negative terminals of rectifier diodes D3 and D7 are connected to the third terminal of the indicator unit. The positive terminals of rectifier diodes D7 and D8 are connected to the third terminal of the indicator unit. The positive terminals of rectifier diodes D8 and D4 are connected to the fourth terminal of the indicator unit.
[0029] This invention effectively suppresses high-frequency noise and instantaneous voltage fluctuations in the ship's electrical network through the rectification characteristics of a dual-bridge common-pole circuit. The reverse cutoff function of the diode blocks the reverse interference of abnormal current, and the filtering effect of capacitors C1 and C2 further smooths the signal waveform, ensuring that the detection logic only responds to the actual line sequence state, rather than transient anomalies caused by environmental interference.
[0030] In addition, the detection unit also includes capacitors C1 and C2. The first end of capacitor C1 is connected to the positive terminal of rectifier diode D5 and the negative terminal of rectifier diode D6, and the second end of capacitor C1 is connected to the second detection interface of the detection unit. The first end of capacitor C2 is connected to the positive terminal of rectifier diode D7 and the negative terminal of rectifier diode D8, and the second end of capacitor C2 is connected to the third detection interface of the detection unit.
[0031] This invention utilizes capacitors C1 and C2 (filter capacitors) to form a composite filter network with rectifier diodes, effectively absorbing transient voltage fluctuations and high-frequency noise in the ship's electrical network. During the switching between music and command broadcasts, pulse interference signals generated by the power amplifier are absorbed and smoothly released by the capacitors, preventing abnormal voltage spikes from interfering with the logic judgment of the detection unit. This filtering mechanism ensures that the conduction state of the rectifier diodes (D1-D8) reflects only the actual wiring sequence, rather than false triggering caused by external interference, thus significantly improving the accuracy of fault diagnosis. Furthermore, the energy storage characteristics of the capacitors provide a stable potential reference for the detection unit. When the broadcast system experiences a sudden voltage drop due to load changes, capacitors C1 (connected to the second detection interface) and C2 (connected to the third detection interface) can quickly compensate for the energy gap, maintaining the stability of the rectifier bridge arm operating point. This dynamic voltage regulation capability ensures that the on / off state of the indicator lights (LED1 / LED2) strictly corresponds to the correct wiring sequence, rather than false displays caused by power fluctuations, fundamentally avoiding misjudgments caused by voltage instability.
[0032] The indicating unit includes indicator LED1 and indicator LED2. The first terminal of indicator LED1 is connected to the negative terminals of rectifier diodes D1 and D5, and the second terminal of indicator LED1 is connected to the positive terminals of rectifier diodes D6 and D2. The first terminal of indicator LED2 is connected to the negative terminals of rectifier diodes D3 and D7, and the second terminal of indicator LED2 is connected to the positive terminals of rectifier diodes D8 and D4. For easy observation of the detection results, indicator LED1 is a green light-emitting diode, and indicator LED2 is a red light-emitting diode.
[0033] In addition, the indicator unit also includes resistors R1 and R2. The first end of resistor R1 is connected to the first end of indicator LED1, and the second end of resistor R1 is connected to the negative terminals of rectifier diodes D1 and D5. The first end of resistor R2 is connected to the first end of indicator LED2, and the second end of resistor R2 is connected to the negative terminals of rectifier diodes D3 and D7. Furthermore, the first end of resistor R1 can also be connected to the second end of indicator LED1, and the second end of resistor R1 can be connected to the positive terminals of rectifier diodes D6 and D2. The first end of resistor R2 can also be connected to the second end of indicator LED2, and the second end of resistor R2 can be connected to the positive terminals of rectifier diodes D4 and D8.
[0034] In this invention, resistors R1 and R2 act as current-limiting elements, connected in series in the circuit of the indicator lights (LED1 / LED2) to precisely control the current intensity flowing through the LEDs. When the detection unit is connected to lines with different potential differences (such as the high level of the music broadcast port or the pulse signal of the command broadcast port), the matching resistance values effectively suppress the instantaneous impact of surge current on the LEDs, preventing the LEDs from burning out due to overload. Simultaneously, the voltage drop characteristics of the resistors can adapt to the wide voltage fluctuations of the ship's electrical network, ensuring stable indicator light brightness and avoiding visual misjudgments caused by voltage instability. Furthermore, the symmetrical configuration of resistors R1 and R2 in the dual-bridge common-pole circuit balances the impedance characteristics of the two detection branches. This symmetrical design offsets the influence of temperature changes in the ship's environment on the differences in component parameters, and the power redundancy design of the resistors can withstand the micro-discharge at the contact points caused by long-term vibration, avoiding detection deviations caused by resistance drift.
[0035] Furthermore, the speaker circuit testing device also includes a housing, inside which is a circuit board for mounting the testing unit and the indicator unit, and the housing is provided with mounting holes corresponding to indicator lights LED1 and LED2.
[0036] The speaker under test is equipped with three ports: port 1 is the common port, port 2 is the music broadcast port, and port 3 is the command broadcast port. In order to facilitate the testing unit to perform fault detection on the speaker under test, the speaker circuit testing device also includes a probe connected to each testing interface. The probe can be a clip-on probe, which is convenient for disassembly or connection during testing.
[0037] The working principle of this speaker circuit testing device is as follows: When performing circuit sequence testing on the speaker to be tested, connect the first detection interface, the second detection interface, and the third detection interface of the testing unit to port 1, port 2, and port 3 of the speaker to be tested, respectively; play music or broadcast a command through the speaker, observe the on / off status of indicator LED1 (green light) and indicator LED2 (red light), and refer to Table 1 to determine the wiring fault of the speaker.
[0038] Table 1: Comparison Table of Indicator Unit Status and Speaker Wiring Faults
[0039]
[0040] The specific test results are as follows:
[0041] First, play music through the speaker. If indicator LED1 (green light) lights up and indicator LED2 (red light) goes out, turn off the music and play a broadcast through the speaker. If indicator LED2 (red light) lights up and indicator LED1 (green light) goes out, referring to Table 1, it can be seen that the speaker under test does not have a circuit fault.
[0042] First, play music through the speaker. If indicator LED1 (green light) goes out and indicator LED2 (red light) turns on, turn off the music and play a broadcast through the speaker. If indicator LED2 (red light) goes out and indicator LED1 (green light) turns on, referring to Table 1, it can be seen that there is a reversed wiring fault on ports 2 and 3 of the speaker to be tested.
[0043] First, play music through the speaker. If indicator LED1 (green light) lights up and indicator LED2 (red light) lights up, turn off the music and play a broadcast through the speaker. If indicator LED2 (red light) lights up and indicator LED1 (green light) goes out, referring to Table 1, it can be seen that there is a reversed wiring fault on port 1 and port 2 of the speaker to be tested.
[0044] First, play music through the speaker. If indicator LED1 (green light) lights up and indicator LED2 (red light) lights up, turn off the music and play a broadcast through the speaker. If indicator LED2 (red light) goes out and indicator LED1 (green light) lights up, referring to Table 1, it can be seen that the wiring harness of port 2 is incorrectly connected to port 1 of the speaker to be tested, the wiring harness of port 3 is incorrectly connected to port 2, and the wiring harness of port 1 is incorrectly connected to port 3.
[0045] First, play music through the speaker. If indicator LED1 (green light) is off and indicator LED2 (red light) is on, turn off the music and play a broadcast through the speaker. If indicator LED2 (red light) is on and indicator LED1 (green light) is on, referring to Table 1, it can be seen that the wiring harness of port 3 is incorrectly connected to port 1 of the speaker to be tested, the wiring harness of port 1 is incorrectly connected to port 2, and the wiring harness of port 2 is incorrectly connected to port 3.
[0046] First, play music through the speaker. If indicator LED1 (green light) lights up and indicator LED2 (red light) goes out, turn off the music and play a broadcast through the speaker. If indicator LED2 (red light) lights up and indicator LED1 (green light) lights up, referring to Table 1, it can be seen that there is a reversed wiring sequence fault on port 1 and port 3 of the speaker to be tested.
[0047] First, play music through the speaker. If indicator LED1 (green light) lights up and indicator LED2 (red light) goes out, turn off the music and play a broadcast through the speaker. If indicator LED2 (red light) lights up and indicator LED1 (green light) lights up, referring to Table 1, it can be seen that there is a disconnection fault at port 1 of the speaker to be tested.
[0048] First, play music through the speaker. If indicator LED1 (green light) is off and indicator LED2 (red light) is off, turn off the music and play a broadcast through the speaker. If indicator LED2 (red light) is on and indicator LED1 (green light) is off, referring to Table 1, it can be seen that there is a disconnection fault at port 2 of the speaker to be tested.
[0049] First, play music through the speaker. If indicator LED1 (green light) lights up and indicator LED2 (red light) goes out, turn off the music and play a broadcast through the speaker. If indicator LED2 (red light) goes out and indicator LED1 (green light) goes out, referring to Table 1, it can be seen that there is a disconnection fault at port 3 of the speaker to be tested.
[0050] This invention, based on the nonlinear detection characteristics of a dual-bridge common-pole circuit, overcomes the dependence of traditional measuring equipment on equivalent impedance. During detection, the speaker circuit type is determined by the on / off status of LED1 and LED2 in the indicator unit, which is simple and clear. In addition, the filter capacitors C1 and C2 configured in the detection unit form a composite filter network with the rectifier diode, which effectively suppresses voltage fluctuation interference in the ship's power grid. Combined with the protection circuit composed of current-limiting resistors R1 and R2, the device can achieve real-time online detection while the broadcast system is continuously working, avoiding communication interruptions caused by traditional power-off detection.
[0051] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A loudspeaker circuit testing device, characterized in that, It includes a detection unit containing a dual-bridge common-pole circuit and an indicator unit connected to the output of the detection unit. The input of the detection unit is connected to the power amplifier output of the speaker under test. The detection unit is equipped with a first detection interface, a second detection interface and a third detection interface; the dual-bridge common-pole circuit includes rectifier diodes D1, D2, D3, D4, D5, D6, D7 and D8; The positive terminals of rectifier diodes D1, D2, D3, and D4 are all connected to the first detection interface of the detection unit; the negative terminals of rectifier diodes D1 and D5 are connected to the first terminal of the indicator unit; the positive terminals of rectifier diodes D5 and D6 are connected to the second detection interface of the detection unit; the positive terminals of rectifier diodes D6 and D2 are connected to the second terminal of the indicator unit; the negative terminals of rectifier diodes D3 and D7 are connected to the third terminal of the indicator unit; the positive terminals of rectifier diodes D7 and D8 are connected to the third detection interface of the detection unit; and the positive terminals of rectifier diodes D8 and D4 are connected to the fourth terminal of the indicator unit.
2. The loudspeaker circuit testing device according to claim 1, characterized in that, The detection unit also includes a capacitor C1. The first end of the capacitor C1 is connected to the positive terminal of the rectifier diode D5 and the negative terminal of the rectifier diode D6, and the second end of the capacitor C1 is connected to the second detection interface of the detection unit.
3. The loudspeaker circuit testing device according to claim 1, characterized in that, The detection unit also includes a capacitor C2. The first end of the capacitor C2 is connected to the positive terminal of the rectifier diode D7 and the negative terminal of the rectifier diode D8, and the second end of the capacitor C2 is connected to the third detection interface of the detection unit.
4. The loudspeaker circuit testing device according to claim 1, characterized in that, The indicator unit includes indicator LED1 and indicator LED2; The first terminal of indicator LED1 is connected to the negative terminals of rectifier diodes D1 and D5, and the second terminal of indicator LED1 is connected to the positive terminals of rectifier diodes D6 and D2. The first terminal of indicator LED2 is connected to the negative terminals of rectifier diodes D3 and D7, and the second terminal of indicator LED2 is connected to the positive terminals of rectifier diodes D8 and D4.
5. The loudspeaker circuit testing device according to claim 4, characterized in that, The indicator unit also includes a resistor R1, the first end of which is connected to the first end of the indicator LED1, and the second end of which is connected to the negative terminals of rectifier diodes D1 and D5.
6. The loudspeaker circuit testing device according to claim 4, characterized in that, The indicator unit also includes a resistor R2, the first end of which is connected to the first end of the indicator LED2, and the second end of which is connected to the negative terminals of the rectifier diodes D3 and D7.
7. The loudspeaker circuit testing device according to claim 4, characterized in that, It also includes a housing, inside which is a circuit board for mounting the detection unit and the indicator unit.
8. The loudspeaker circuit testing device according to claim 7, characterized in that, The housing is provided with mounting holes corresponding to indicator lights LED1 and LED2.
9. The loudspeaker circuit testing device according to claim 1, characterized in that, It also includes probes that connect to each detection interface.